His first appearance on the big screen was as "boy on raft" in the 1980 movie Harlequin. He graduated in 1990 from the National Institute of Dramatic Art in Sydney, with a degree in Performing Arts (Acting).[2] In 2015, Sims landed a supporting role in Ruben Guthrie.
He is remembered by many for his role as Alex Taylor in the television soap opera Chances (1991–1992).
In 1995, together with then girlfriend Kym Wilson, Sims formed the theatrical production company "Pork Chop Productions".[1][3] Pork Chop won a Drover's award in 2005 for their production of the play, "Last Cab To Darwin".[4]