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 secured a three-year agreement with Kilmarnock in July 2008 after a brief evaluation, making his debut on August 9, 2008, as the team emerged victorious 1–0 against Hibernian.