Defender Sean Byrne’s football career started at Belvedere and Home Farm football clubs. Having joined Bohemians in early 2008, he made his first team debut away to Galway United in April 2009.
He signed for Shelbourne, managed by Dermot Keely, at the start of 2010 and made 29 appearances, scoring twice that year. The following season, Sean made 12 league appearances with the Reds, six from the bench. He also had three appearances in the EA Cup, one in the Leinster Senior Cup and five in the FAI Cup, including in the final against Sligo Rovers, which Shelbourne lost in a penalty shootout after extra time. Following promotion to the Premier Division for 2012, Sean made 13 league appearances, one in each of the EA and LS Cups and three in the FAI Cup.
He left Tolka Park at the end of that season and trialled with Athlone Town, managed by Roddy Collins. He did not, however, sign for the Midlanders until July ’13 and was part of the team that won the First Division title and promotion. He played in 17 Premier Division games for Athlone before leaving at the end of August, because of work commitments.
He signed for Tolka Rovers at the start of 2015 but returned to League of Ireland action with Waterford United in January 2016, where he made 15 league appearances. Later that year, he joined Leinster Senior League team St. Mochtas, where he picked up a LSL Senior Division winners medal.