Sims played his junior football for the Gerringong Lions and Wests Panthers before being signed by the Brisbane Broncos, along with his brothers, Ashton and Tariq in 2008. Sims played for the Queensland U16's and U18's teams.[4] He played for the Broncos NYC team in 2010, playing alongside his brother Tariq, scoring 2 tries in 9 games.[5] In 2011, Sims joined the Newcastle Knights, playing in the NYC team in 2011 and 2012, scoring 14 tries in 40 games.[5]
On 3 June, Sims re-signed with the Newcastle side on a two-year contract after rejecting offers from North Queensland and the Manly-Warringah Sea Eagles.[10] Sims made 12 appearances for the season. He was selected in the Fiji 24-man squad along his brothers Ashton and Tariq for the 2013 Rugby League World Cup,[11] playing in 3 matches and scoring a try in his Fiji international debut against Ireland in the 32–14 win at Spotland Stadium.[12]
2014
In Round 7 against the Brisbane Broncos, Sims scored his first NRL career try in Newcastle's 32–6 loss at Hunter Stadium.[13] In May, Sims played for Fiji in the Pacific Rugby League International. Fiji lost the test match 32–16, but Korbin stole the limelight with a massive shot on Samoan opponent Isaac Liu.[14] Sims finished the year with him playing in 20 matches and scoring 2 tries.
2015
In the pre-season, Sims played for Newcastle in the 2015 NRL Auckland Nines.[15] On 13 March, he again re-signed with the Newcastle outfit on a two-year contract.[16]
On 10 May, Sims groped the genitals of opposition player and former teammate Willie Mason, an action described by Rugby League writer Brad Walter as being "infantile", "bizarre and offensive", and worthy of punishment due to the potential for the incident to portray the NRL in a distasteful and damaging light.[19] Despite some rugby league reporters calling for harsh disciplinary action as a result of the incident,[19] Mason was unperturbed, stating that he found the incident "hilarious."[20] Sims received a warning from the NRL match review committee.[20] Sims apologized for any offence caused to those who were watching the game and described it as a "harmless gesture between two friends."[20]
On 10 June, Sims was named as 20th-man for the Queensland team for game 2 of the 2015 State of Origin series. In the same match, his brother, Tariq, was named as 19th-man for New South Wales.[21] However, neither of them played in the match. Sims finished off the 2015 season having played in 22 matches and scoring two tries.[22]
2016
On 12 January, Sims was selected in the QAS Emerging Maroons squad.[23] In February, he played for the Knights in the 2016 NRL Auckland Nines.[24] He finished the 2016 season having played in 22 matches and scoring three tries.[25] In October, he played for Fiji against Samoa, starting at lock in the 20–18 win at Apia Park.[26]
2017
In January, Sims signed a two-year contract with the Brisbane Broncos starting effective immediately, after being released from the final year of his Knights contract.[27][28]
In Round 25 against the Parramatta Eels, Sims suffered a season ending arm injury in Brisbane's 52–34 loss at Suncorp Stadium, later ruining his chances to play for Fiji in the 2017 Rugby League World Cup.[32][33] Sims finished the 2017 NRL season with him playing in 22 matches and scoring 5 tries for the Brisbane club.
On 18 July, Sims signed a three-year deal to join the St. George Illawarra Dragons starting in 2019.[36]
On 9 September, Sims endured a horror afternoon on the field against his future side St. George Illawarra as his brother Tariq ran past him on three occasions to score a hat-trick in the club's 48–18 defeat in week one of the finals eliminating Brisbane from the competition.[37]
2019
Sims made his debut for St. George Illawarra against his former club the Brisbane Broncos scoring a try in a 25–24 victory at Suncorp Stadium. The following week, Sims was taken from the field with what was later to be revealed as a broken arm. Sims had remained on the field for a further 15 minutes after breaking his arm despite being in obvious discomfort. Sims was later ruled out for 8 weeks.[38]
Sims made a total of 16 appearances for St. George Illawarra in the 2019 NRL season as the club suffered one of their worst ever seasons finishing in 15th place on the table.[39]
2020
On 15 February, Sims suffered a broken arm whilst playing for St. George Illawarra in the pre-season NRL Nines tournament against Parramatta. Sims was seen by cameras leaving the field in emotional distress.[40]
Sims was limited to only five games throughout the season as St. George Illawarra finished 13th on the table and missed out on the finals.[41]
Sims played 14 games for Hull Kingston Rovers in the 2021 Super League season as the club came within one game of the grand final.
2022
On 29 August, it was announced that Sims would be one of eleven players who were to depart Hull Kingston Rovers at the end of the 2022 season.[44]
On 30 August, Sims was suspended for three matches by the RFL. On the same day, Sims announced his retirement from Rugby League.[45]
Sims later came out of retirement to play for Fiji at the 2021 Rugby League World Cup. Sims played for Fiji in their controversial quarter final loss to New Zealand at the MKM Stadium. After the match, Sims announced his retirement for a second time.[46]
^Ziaziaris, Simone (6 May 2017). "Late Latu try grabs Test win for Tonga". Wide World of Sports. Nine Digital. Australian Associated Press. Archived from the original on 14 June 2017. Retrieved 21 June 2017.
^Walter, Brad; Walsh, Dan (18 July 2018). "Sims's to reunite at Red V". St George Illawarra Dragons. National Rugby League. Archived from the original on 19 July 2018. Retrieved 19 July 2018.
