 Sims hit career best form for the Cowboys in 2012 averaging 108 metres and 22 tackles, he did an admirable job in the Cowboys starting pack while rep star Matthew Scott was out with a foot injury.On 11 May 2012 it was announced that the oldest Sims brother had re-signed with the club for a further two seasons, which saw him at the club until the end of the 2014 NRL season.Sims signed for Warrington Wolves ready for the 'New Era' of Super League in 2015, with a reformatted competition.