He said that he "started" down south, "so I still do them (southern movies)."
"Southern films give me a chance to choose only a few Hindi films and the best ones. I try to maintain a balance," the 41-year-old said Monday at the launch of a new perfume here.
"So, I have done around 55-60 films in many languages. Next month there is a Telugu release and then 'Happy New Year' in October. So I will try to maintain a balance between the two industries," he added.
"Happy New Year" has been directed by Farah Khan and has an ensemble cast that includes superstar Shah Rukh Khan, Deepika Padukone, Abhishek Bachchan, Boman Irani and Vivan Shah, apart from Sonu.
The film is slated for a Diwali release this year.