Sadagopan is an Indian screenwriter and director who works in the Tamil cinema. He has written nearly 60 films, and directed 27 of them. He scripted dramatic films such as Moondru Dheivangal and Shanti Nilayam and comedies such as Kadhalikka Neramillai, Galatta Kalyanam, Patti Sollai Thattathe and Uttharavindri Ulle Vaa.

Moondru Deivangal is a 1971 Indian Tamil-language drama film, directed by Dada Mirasi and written by Chitralaya Gopu. The film stars Sivaji Ganesan, Muthuraman and Nagesh. It is a remake of the 1968 Marathi film Aamhi Jato Amuchya Gava. The film was released on 14 August 1971.