According to CBC Canada \\"Instead, the sci-fi space epic will come out in theatres and on HBO simultaneously in the United States. Unfortunately, Canadian audiences will have to wait until Dune completes the standard theatrical window before it premieres on Crave for home streaming.\\" This means you can't watch Dune online in Canada on the same day of release. However, you can access HBO Max in Canada by following the steps and one of the recommended VPNs mentioned above and watch Dune on the same day of global release.