[5][6] In Sims' next match in round 3 against the Melbourne Storm, he scored his first NRL career try in North Queensland's 34–6 win at 1300SMILES Stadium.

[14] Just 7 matches into his comeback from a broken leg, playing against the Penrith Panthers, Sims attempted to save a try but was involved in a freak accident with Penrith back rower Cameron Ciraldo which ended with Sims breaking his leg for a second time in the space of a year and in exactly the same spot as the previous break.

[15] Sims had a successful surgery which involved a steel rod being inserted into his leg to help with the healing process and to stop another break.

He returned to full contact training in the week of the Cowboys' semi-final loss to the Manly Warringah Sea Eagles.

On 21 December, Sims was taken to hospital after suffering from dehydration at North Queensland's off season army-style boot camp at Lavarack Barracks.

Qualifying through his mother, Sims was selected in the Fiji squad for the 2013 Rugby League World Cup alongside his brothers, Ashton and Korbin.

[22] On 16 September 2014, Sims missed the rest of the NRL finals series after making a guilty plea for a grade three shoulder charge offence for a second-half incident with Brisbane Broncos fullback Justin Hodges in North Queensland's 32–20 victory in Week 1 of the elimination finals at 1300SMILES Stadium.

[28] On 12 June, Sims was called into the New South Wales Blues squad as cover, being named as 19th man for Game 2 of the 2015 State of Origin series after Dragons forward Tyson Frizell was ruled out from injury.

A disastrous run of form, culminating in a heart breaking round 26 loss to Canterbury which allowed North Queensland to overtake them into 8th spot, saw them miss out on the finals.

In week one of the finals, St George Illawarra faced a highly fancied Brisbane side at Suncorp Stadium with not many experts predicting an upset.

The following week, Sims was taken from the field with a knee injury as St George Illawarra were eliminated from the finals series losing 13–12 to South Sydney.

In round 21 of the 2019 NRL season, Sims scored 2 tries as St George Illawarra defeated the Gold Coast 40–28 at Kogarah Oval.

Sims had been battling the groin injury for most of the year but decided to undergo surgery as St George Illawarra had been ruled out of finals contention.

[46] In round 4 of the 2021 NRL season, Sims put in a man of the match performance scoring two tries in his side's 22–13 victory over Newcastle.

[48] Sims played a total of 21 matches for St. George Illawarra in the 2021 NRL season as the club finished 11th on the table and missed out on the finals.

[52] In round 21, Sims was sent to the sin bin for a dangerous high tackle where he knocked out Cronulla's Connor Tracey during St. George Illawarra's 24–18 loss.

[54] On 28 August 2023, Sims signed a two-year deal to join Super League side the Catalans Dragons.

His elder sister Ruan Sims currently plays for the Sydney Roosters in the NRL Women's Premiership, while his other sister, Canecia (CJ) has previously played American football (gridiron) for the Gold Coast Stingrays,[59] but in 2019 signed with the Tweed Heads Seagulls rugby league club.