Although there are some words of Portuguese origin in Haitian Creole, like kachimbo 'earthenware pipe', there is no save word meaning 'know'. 'Know' is expressed by another word, konnen (< connaître).
Sa (< savoir) exists as an attenuated alternative of the modal kapab 'be able to'. The Atlas linguistique d'Haïti (Fattier 1998: 876-877) lists two meanings of sa:
mwen vini pou m sa palé avè w
1SG come PREP 1SG MOD talk PREP 2SG
'I have come in order to talk to you.'
li pèd pawòl, li pa sa palé
3SG lose word, 3SG NEG MOD speak
'He has lost his voice, he can't speak.'