He played hurling with his local club Ballygunner and with the Waterford senior inter-county team.
He was educated locally and from an early age showed a great deal of interest in hurling.
Billy played his club hurling with his local Ballygunner team.
In 2000 Billy suffered a serious ankle injury against Killkenny in the national league.
Billy is brother to the present Waterford inter-county hurler, Shane O'Sullivan.