In August 2009 he began dating Dutch actress and presenter Yolanthe Cabau van Kasbergen. They became engaged in December 2009 and married on 17 July 2010. By her inspiration, Sneijder became Catholic and was baptized in Milan.
Sneijder has two brothers, Jeffrey Sneijder, a former footballer and Rodney who plays for Jong Ajax. In May 2008, it was reported that Sneijder had prevented his younger brother Rodney from a summer transfer to his club at the time, Real Madrid. Sneijder said, “Real Madrid wanted him and Rodney was very happy about that. But when I heard, I stopped the discussions. I am not in favour of juniors increasingly going to top clubs. I’ve told him that he first must make a break through at Ajax.