After playing for Cambridge Boys he moved to
Dundalk where he was an understudy to Richie Blackmore. He did make his debut, keeping a clean sheet, at Finn Harps on 13 February 1983. He made a total of 2 appearances for Dundalk keeping 2 clean sheets in his 2 years there. In April 1983 he played for the
League of Ireland XI U21s against their Italian League counterparts who included
Roberto Mancini and
Gianluca Vialli in their team. In May 1983,
Jim McLaughlin brought Byrne to Shamrock Rovers and at
Milltown he went to win four League medals and the FAI Cup three times. In his 7 years at Rovers Byrne played 196 league games keeping 76 clean sheets. He played 302 competitive games altogether including 8 games in the
European Champion Clubs' Cup keeping 2 clean sheets. He was Player of the Year on two occasions in 1986/87 and 1988/89 Shamrock Rovers#Player of the Year Award recipients. He was everpresent for two consecutive seasons: 1987/88 and 1988/89. In 1990, he moved to
Shelbourne where he helped the Reds to their first league title in 30 years in 1992 and their first FAI Cup success in thirty years in 1993. He got sent off after only 27 seconds on St Patrick's Day 1992!. He then had spells at Cork City and Dundalk again. ==Honours==