Sujatha Mohan is the granddaughter of Parur T. K. Narayana Pillai, the first Chief Minister of the erstwhile Travancore-Cochin State after Independence. She is married to Dr. Mohan. Her only daughter, Shweta Mohan, is also a singer. Shweta is married to Ashwin from Trivandrum. She has sung a lot of songs in Malayalam making her the fourth most prolific Malayalam female singer after K S Chitra, S. Janaki and P. Susheela. She has sung many songs in Malayalam, making her the fourth most prolific Malayalam singer. Mohan is the granddaughter of paravur T. K. Narayana Pillai, the first Chief Minister of the erstwhile Cochin State after Independence. Her first song was Kalai Paniyil from the Tamil Film Gayathri (1977), starring Sridevi Rajinikanth, music by Ilayaraja. Her first Tamil hit film song was Puthu Vellai Mazhai from Mani Ratnam's 1992 film Roja, composed by A. R. Rahman. She has had other hit songs from films including Gentleman (1993), Indian (1996) and Minsaara Kanavu (1997).
She made a strong comeback in the Malayalam film industry in the mid-1990s and most of her notable Malayalam songs were composed by Vidyasagar. Most of her hit songs from Telugu are composed by Mani Sharma.She was also a judge in munch star singer junior,IDEA star singer,AIRTEL super singer (VIJAY TV).