Øyafossen is quite a remote waterfall between Kleivaland and Øvre Tysdalsvatnet (Hjelmeland) in teh region Rogaland, Norway.
From Hjelmeland take road Fv660 east to Kleivaland (there are signs to Kleivaland). There should be a parking near Kleivaland. I am not sure if you drive further to a farm called Ritland. Advise is to park the car at Kleivaland.
From here a signed trail brings you into the Vormedalen along some old abandoned farmhouses: Ritland and Helgaland. The walk takes about 1,5 hour.