This is a molecule studied by Professor Wang Yu.  It is not easy explained with use of VBT of high school level.  SO₂ is a bent molecule with two extra electrons on S.  One may form the sigma bond with C, and the other is used for pi bond.  Of course, the hybridization on S will not be typical sp³.  I would say one p orbital is more used for the pi interaction, and the rest s, and p orbitals are more used for the sigma bonding.