Senasinghe was born in Kandy, the son of Stanley Senasinghe, a senior lawyer in Kandy and Upamalika Senasinghe, a lecturer. He is the youngest of three brothers; his brothers are Namal and Chaminda. Sujeewa was educated at Trinity College, Kandy and at the Sri Lanka Law College.[3]
Sujeewa obtained 117,049 preferential votes from the Colombo district at the General Elections held on 17 August 2015. This was the second highest number of preferential votes obtained by a United National Party member from the Colombo district.[4][5]
He was appointed Deputy Minister of Justice on 12 January 2015 under 100 Days Program. He belongs to the United National Party.[6][7]
In 2017 he was appointed State Minister of Trade and Investment and in 2019 the Non-Cabinet Minister of Science and Technology, under Prime Minister Ranil Wickramasinghe.
