He was born in Mbarara District circa 1975. Sabiiti’s father Zekeriah Muzeyi Magyenyi was married to one of Museveni’s maternal aunties. A veteran of Uganda's bush war, Magyenyi died in June 2007. Sabiiti’s mother is Javanis Magyenyi. The young Sabiiti attended Ntare School, then Mbarara High School before he was admitted to Makerere University, Uganda's oldest and largest public university.