Since 1965, Sontosh Kumar is performing in India. 1990, 1991 he toured Europe and 1992 -94 he toured USA. In Kolkata, India he has performed at various festival such as Orient Music Conference, Ragini Music Conference, Tansen Music Conference and international Marshall Art festival. In Delhi, India he has performed at Kathak Mahotsav , after that Bharatiya Vidyabhavan, National Festival of Kathak Dance Kalka Bindadin Jayanti.
In Abroad in 1990 he has choreographed an evening length Kathak Ballet "Swarga Shava" and also performed in Red Bridge Festival at London, U.K. He also dance at many other performances at Germany, France and England.
In 1991 he has performed at festival of Asian Dance and Music at Bedfordshire, London, U.K. In 1992 he toured USA. He performed several performances in Minnesota, Massachusetts, Virginia, New York, Texas and California. In 1994 his USA tour included performances in collaboration works with Rincon Del Flamenco, a renowned Spanish Flamenco Dance Company.