Sak Muwaan was a king of the Maya city Motul de San José in Guatemala. He ruled sometime between 700 and 726.
An Ik-style vessel possesses a hieroglyphic text declaring that it was the property of Chuy-ti Chan, the son of Sak Muwaan. Chuy-ti Chan is described as an artist and ballplayer.
His successor was Yajaw Te' K'inich.