Martin started his professional career in 1989, playing for Waikato in New Zealand domestic competitions. He made the Northern Zone U13s team in 1986, the New Zealand U15s Schoolboy Kiwis in 1988 and the New Zealand U17s in 1989. He was a Junior Kiwi in 1992, being part of a successful team who defeated the Junior Kangaroos. In 1993 Moana signed with Auckland Warriors and toured Australia.
In the 1994 Lion Red Cup Moana scored 14 tries in 22 games for the Waikato Cougars. He was then selected for the New Zealand Residents' tour of Australia and named in the New Zealand Māori side for the 1994 Pacific Cup in Fiji.
In 1995 he played for the Auckland Warriors and was in the inaugural side. He also represented New Zealand in the 1995 World Sevens.
Moana was not retained by the Warriors at the end of the year and in 1996 he joined Halifax in the Super League competition. He played there for five years and became a legend around Halifax. Moana competed for the Aotearoa Māori at the 2000 Rugby League World Cup.
At the end of 2000 Moana left Halifax and became something of a rugby league nomad. He spent 2001 at both Huddersfield and Doncaster, 2002 at Wakefield Trinity, returned briefly to Halifax for the start of 2003 before finishing the season with the Salford City Reds. In 2005 he moved again re-joining Doncaster before seemingly settling at Swinton where he was player of the year in 2006. He remained with the Swinton Lions until his retirement at the end of the 2009 season.
Following his departure from professional Rugby League, Martin joined Yorkshire 1 Club, Heath RUFC, where he has been a First Team stalwart ever since - in the centre berth.