Yes, why not?! Just like any other player, you can win a jackpot online. The device you play with, is not important. A mobile player has the same win chances as the desktop players or the 'brick casino' audience.
Of course: you have more chance to grab the Jack if you play with the highest stakes!
If you are looking for a list of casinos with a running jackpot on their homepage, go to Casinos with live running jackpots