When these slab doors where in style many lumber yards carried replacement skins. Now you may have to find a hardwood store to find a whole sheet if you could replace the skin.
It looks like you have damage to the bottom of the door too so that might make it really tricky.
Lot's of people are replacing these with 6 panel doors, you might get lucky looking for used.
If you can't find anything, look up the people that do repairs for insurance companies after fires and such, they can usually source anything to match an older decor.