Mooney made his debut for Sydney in 1992 and played mostly as a defender and in the ruck.
He played an important part in Sydney's 1996 Finals campaign, kicking three goals in their six-point Qualifying Final win over Hawthorn in the absence of star forward Tony Lockett.
He was used as a centre half-forward in the 1996 Grand Final but finished on the losing team.
His tally included a career best bag of five against Essendon in Round 11.
He is the older brother of Geelong premiership player Cameron Mooney and played alongside him in 2000 and 2001.