After a short trial, Sammon signed a three-year deal with Kilmarnock in July 2008 for an undisclosed fee, and made his debut on 9 August 2008 in a 1–0 win against Hibernian.
Sammon's tenure began when he signed a three-year contract with Kilmarnock in July 2008 following an initial assessment, and he made his first match on August 9, 2008, as Kilmarnock secured a 1–0 win over Hibernian.