Sisoulith was born in the Houaphan province of Laos, and he studied at Pedagogical College of Neo Lao Hak Sat in Houaphan from 1962 to 1969.
Sisoulith lahir di provinsi Houaphan, Laos, dan ia belajar di Kolese Pedagogikal Neo Lao Hak Sat di Houaphan dari 1962 sampai 1969.