Sagar received primary education at a neighbourhood school conducted at the home of teacher Jagat Lal Master.
[5] In a bid to promote publishing in Nepal Bhasa, Sagar formed a partnership with two like-minded former Tibetan traders, Purna Kaji Tamrakar and Ratna Man Singh Tuladhar, and in 1952 established Nepal Press at his home at 11/122 Asan Tyouda Tol, Kathmandu.
He was a member of Dharmodaya Sabha (Society for the Rise of the Teaching), a Buddhist organization founded in 1944 in Sarnath, India by exiled Nepalese monks and dedicated to promoting Theravada Buddhism.
[6] In 1957, he was secretary of the Kathmandu chapter of the Nepalese Chamber of Commerce, Lhasa when it hosted a reception to honour visiting Chinese Premier Zhou Enlai.
[9] In 2008, chairman of the Constituent Assembly Subash Nemwang presented Sagar with a letter of felicitation to honour his contribution to Buddhism in Nepal at a function organised by Dharmodaya Sabha.