Sims (born 2 December 1971) began playing in WDF ranked events in 2006, mainly playing in events based in his homeland. He reached the quarter finals of the Pacific Masters in 2006 and 2006 and followed it up by reaching the final of the 2007 Australian Masters where he lost to Simon Whitlock.
Sims made 3 ranked semi final appearances in 2008, ion the Pacific Masters, Malaysian Open and the New Zealand Masters. He had earlier reached the semi finals of the Central Coast Australian Classic, an unranked event. Sims then won the 2008 Australian Master, defeating Adam Bainbridge in the final. His good performances in 2008 earned Sims automatic qualification for the 2009 BDO World Darts Championship, entered as the number 16 seed. .