	He has had a lot of success at club level with Skellig Rangers and South Kerry. He won 4 County Senior Championships with South Kerry, 3 in a row from 2004–06 and again in 2009. With Skellig Rangers he won a South Kerry Championship title in 2006, the club's first since 1968. 2008 would become the greatest in Skellig Rangers history when they won the County & Munster Junior Championship with O'Sullivan a key to the success; the team continued their success into 2009 when they won the All Ireland title.