You can stream it exclusively on Netflix with a standard subscription.
This response uses data provided by Google's Knowledge Graph
In the village of Gavaldon, Sophie (Sophia Anne Caruso) dreams of becoming a princess, while Agatha (Sofia Wylie) is dismissed by many as a witch. Their lives change when they are taken to the titular school, but their expected roles are reversed: Sophie is dropped into the School for Evil, and Agatha into the School for Good. The story follows their attempt to right this "mistake," only to discover that the boundaries between goodness and villainy are far more blurred than they imagined. The film was released globally on October 19, 2022.