After retiring from the game he went on to be a coach, assistant manager, caretaker manager, director of football and head of recruitment for clubs north and south of the UK, his recent job was head of recruitment at Dundee United but recently left the club.
Byrne joined Shamrock Rovers in January 1993 also on loan from Watford but only made four league appearances.
He joined Walsall on loan in February 1994 and after leaving Partick played for St Mirren, Ayr United and Albion Rovers where he was player-coach in 1996.
On 28 November 2006, he left his post at PCFE when he was named as the new Youth Team Manager at Swindon Town working under former Plymouth Argyle boss Paul Sturrock.
Since then he has left Tannadice with Dundee United in April 2024 appointing former Southampton's Michael Cairney as Byrne old role.