Yes, orcas also hunt seals, sea lions, and other marine mammals that live on beaches. Orcas will even beach themselves in order to hunt these. And they've even been observed in freshwater rivers [1].

https://www.youtube.com/watch?v=AtF3FPyRVIw

https://www.youtube.com/watch?v=Ks40worW_gQ

https://youtu.be/HY-mefETVZ8?t=3m44s

https://www.youtube.com/watch?v=AkZKM47igpA

[1] http://marinebio.org/species.asp?id=84