Yes, there is no rule to say that somebody who has already been to uni can not do an apprenticeship.
Most companies offering apprenticeships are happy to receive applications from graduates, however be aware that having a degree is unlikely to give you an advantage in gaining an apprenticeship.
Alternatively, If you are a university leaver who left university before graduating, you can also apply to any apprenticeship you wish. Having set foot on a University campus does not blacklist you from the world of apprenticeships!