Boyeli, who was linked with Kaizer Chiefs, joins Babina Noko from Zambian giants Power Dynamos.
Langa joins Sekhukhune after an impressive season in the Motsepe Foundation Championship for University Of Pretoria.
The duo become the latest additions in the Babina Noko squad following the signings of Thabang Monare, Njabulo Ngcobo and Keletso Makgalwa.
The club also parted ways with coach Lehlohonolo Seema and replaced him with German Peter Hyballa. Babina Noko finished fourth this last season and have qualified for the CAF Confederation Cup in the new campaign.
