Rooney joins the club on a free transfer, signing a two-year-deal subject to international clearance once the transfer window opens
Usually a right wing back, Rooney was victorious and scored in both cup finals for St Johnstone last season as well as in both legs of this season’s relegation play-off.
The 25-year-old was much sought after this summer, with Kilmarnock interested and Championship Rotherham United also rumoured to be taking a look at the new Town man.
Rooney has vast experience in Scotland, having played across the top three tiers. He has spent the last two seasons in the Scottish Premiership, making 50 appearances.
However he becomes Scott Brown’s first signing as Fleetwood Town head coach and he will not be the last as the summer’s rebuild continues.
Brown said: “As a player and as a manager I know Shaun really well and know what he can bring to Fleetwood Town.
“I’ve played against him many times and know he’s a real winner, who has determination and will put his body on the line for the team.
“He will bring us a lot of quality defensively and going forward as well. Shaun can play in a few different positions and he’s a great addition to the squad.
“From my point of view to have my first signing a player who I know so well is a big plus for me.
“I’m really looking forward to working with him.”