Moon made his first grade debut for Illawarra in Round 1 1984 against Balmain at Leichhardt Oval.
Moon played with Illawarra up until the end of 1985 as the club finished last on the table claiming the wooden spoon.
Injuries restricted Moon to only 4 appearances over the next 2 seasons until he was released by Souths and joined English side Hull F.C.
In Moon's second spell with Illawarra, the club finished last in his first season back winning only 2 matches all year.
Moon retired at the end of 1991, 1 year before Illawarra were to go within 1 game of reaching their first grand final.