Answer
No, Vujadin Boškov did not win the Serbian SuperLiga as a coach. The Serbian SuperLiga is the top professional football league in Serbia. It was founded in 2006 and replaced the First League of Serbia and Montenegro as the top flight of Serbian football. Boškov was the manager of Partizan Belgrade from 2008 to 2009, but he did not win the Serbian SuperLiga during his time there.