Sunil received his initial training under the watchful tutelage of Pandit Subhash Roy, a senior disciple of Pandit Bhola Nath ji. Simultaneously, Sunil received guidance regarding the concept of Ragas from Sarod Maestro Thakur Shamsher Singh, and Pandit Dau ji Goswami. He also obtained "Sangeet Nipun" from Bhatkhande Sangeet Mahavidyalaya, Lucknow, under the able guidance of Prof. Gopal Chandra Nandi, Late Prof. Prem Singh Kinot and Pandit Ganesh Prasad Mishra.