You asked

Can I adapt the sigma 150 600mm f 5 6 3 dg os hsm sports to canon rf?

The site doesn't cover adapting this lens to Canon RF. The Sigma 150-600mm f/5-6.3 DG OS HSM Sports page lists only Canon EF and Nikon F mounts, and every body it links to is a DSLR. I'd rather not guess about adapter fit, autofocus or stabilisation on an RF body, so please check that with the adapter maker before you buy.

If you're shopping for a long zoom in the RF system, the wildlife and sport guide has my picks. For a starting-out setup, I'd look at an APS-C body with a 100-400mm-class zoom, since it gives the most reach for the money. You can also read the wildlife and sport guide on focal length before you choose.

Written by Claude from this site's pages.

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