Sulfur dioxide does not contain ionic bonds.
Ionic bonds are formed by transfer of electrons while covalent bonds are formed by sharing of electrons.
Ionic bonds are also called electrovalent bonds. They are formed by transfer of electrons from one specie to another.
On the other hand covalent bonds are formed by sharing electrons. Covalent bonds are usually formed between two nonmetals while ionic bonds are usually formed between a metal and a nonmetal.
Sodium oxide is ionic because it is formed from sodium and oxygen (metal and nonmetal). The same applies to aluminium oxide.
The only compound formed from two nonmetals is Sulfur dioxide. It contains covalent bonds.
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