I don't see any reason for an institution trying to teach people something that isn't even available in their country or region because no one would be interested in that in general unless they know that there are casinos, maybe online ones, that are running secretly and the government doesn't know and those who study casino management can start their own but that is going to be illegal, of course, since the government has banned gambling and casinos as a whole.

Someone would only think of starting a school or institution to teach people things that are legal and have scope so that more and more people enroll so that the institution can earn some money also. Besides, I don't think it will be allowed by the authorities if gambling itself is illegal or banned because you can't teach things that aren't legally available within that region or you can also face consequences for that.

Hence, I would say no, casino management courses can't be taught in countries where gambling is banned for obvious reasons.