The only way for you to enter Film City in Mumbai is by the Maharashtra State Government's Tourism Board, who organize tours inside the Film City. Tours are available both in Hindi and English.
The Film City tour package is for a duration of 2 hours and includes a tour to a various number of locations and sets inside the Film City, a guide to discuss anything related to Bollywood and its history and the drop off which will be done at the Film City entrance.
Tour package rate for: Indian citizens - Rs599 per person
Foreigners - Rs3000 per person
When on the tour you can not get off anywhere apart from the canteen stop. You are also not allowed to take photos of the actors.