Dinotopia (2002)

Carl and David, two boys flying a small aircraft over the ocean with their father, crash land near an uncharted island. The boys swim safely to shore, but their father unfortunately drowns in the crash. On their own, the brothers explore the island and soon discover it is not only inhabited by people, but by dinosaurs as well! While the place seems easy enough to get used to, the boys must find a way of returning to their home.