 Shortly after the Broncos' semi-final exit, Sims was named in the Fiji squad for the 2008 Rugby League World Cup and was later confirmed for the final squad.He had only visited Fiji once in his life—for a holiday—but qualified to play for the country because his mother was born there.He was Fiji's starting second-rower for all four of their matches; Fiji qualified for the tournament's semi-final for the first time.