Simonović began his career with Radnički Niš, playing for the team between 1988 and 1994.
He also played for Železničar Niš, Aris Thessaloniki and Obilić, before moving to Levski Sofia in 2002 for a fee of €750,000.
[citation needed] He scored his first goal for the club in his first match against CSKA Sofia.
In three seasons, Simonović earned 83 appearances for Levski and scored 20 goals.
[1] Simonović made his second debut for Levski on 15 August 2009 in a match against Minyor Pernik.