(1) He is married to (Not public).
They got married
(2) He is married to Catharina van Enden.
Permission for the marriage has been obtained in Hontenisse on September 27, 1648.Source 1
datum: 27 sep 1648; naam bruidegom: Jan van Sandijck; weduwnaar van: NN; naam bruid: Catharina van Enden; scan: 24; link naar scan: https://www.familysearch.org/ark:/61903/3:1:3QS7-L9QG-2VBK?i=23&cc=2036997