The Scot made 72 appearances for the Gypsies, scoring 6 goals.
The arrival of the 29 year old from the Premier Division represents a coup for the midlanders, who will be looking secure promotion back to the top flight for the first time since 2015.
Dario Castelo's side finished 4th last season and lost out to Bray Wanderers in the promotion playoff.
Athlone will kick off their 2025 campaign away to Dundalk on the 14th of February