He won the British Amateur Championship in 2001 and was a member of the victorious 2001 Great Britain & Ireland Walker Cup team.

As British Amateur Champion, he was invited to play in the Masters Tournament in 2002, where he missed the cut by a single stroke.

Then in April, he claimed his first European Tour title, at the Estoril Open de Portugal where he defeated Gonzalo Fernández-Castaño on the third hole of a sudden death playoff.

In July 2013, Hoey won his fifth European Tour title at the M2M Russian Open, prevailing by four strokes from Alexandre Kaleka and Matthew Nixon.

Hoey represented Ireland, alongside Gareth Maybin at the 2007 Omega Mission Hills World Cup where they finished in 24th position.