Not really. A fisheye is not just a very short focal length lens; it uses a different projection than a normal ultra-wide lens. Ultra-wide rectilinear lenses are designed to keep straight lines straight, while fisheyes intentionally bend them. Cropping to APS-C removes some of the outermost distortion, but it does not turn a fisheye into a rectilinear ultra-wide.

With the Canon EF 8-15mm f/4L specifically, there’s another issue: at the wide end it is a circular fisheye, so it does not fully cover the frame in the same way a normal lens does. On APS-C, that can still produce dark corners/vignetting until you zoom toward the longer end where coverage improves.

So yes, you can mount and use a full-frame fisheye on APS-C, but it will still look like a fisheye, not like a conventional ultra-wide zoom such as a 10-18mm. If your goal is a normal ultra-wide perspective, a rectilinear ultra-wide lens is the better choice.