Sinha moved to Arakan in British Burma with his father seeking economic opportunities. There he opened a grocery store and went on to expand into manufacturing. They manufactured soap and then pharmaceuticals. The father-son duo made a fortune in manufacturing in Arakan. He made a pilgrimage to the Bihar Kundadham Temple and after he returned he established Kundeswari Temple in Chittagong. He established the Sree Kundeswari Aushadhalaya Ayurvedic medicine factory in Gahira on 1946. He would establish Kundeswari Primary School and Kundeswari girls school in 1960; and Kundeswari Mahila College in 1970. He also built a post office.