Can you play online on TES oblivion Knights of the nine or shivering isles

unfortunatly no. the game itself is huge and amazing. so there was never any need for multiplayer. if in fact you are playing on PC then have a look at some MODS for your game as there are a coupleof people experimenting with multiplayer.
elder scrolls 5 is said to be getting multiplayer but i am unsure when it will be released at this time