Born as Ajay Singh Deol, Sunny is the elder son of Dharmendra and the brother of actor Bobby Deol. He had a sparkling debut in Betaab and has enjoyed tremendous success through action films such as Ghayal, Ghatak and Tridev. He won a National Award for Damini.
In 1999 he turned director with Dillagi, which flopped at the box office.
Sunny is married to Pooja Deol and they have 2 sons. However, he is said to be in a long-term relationship with Dimple Kapadia.