Your best approach is going not going to be simply jumping into a course of SAP. The best course will be finding a firm that will sponsor you in SAP if that is possible. Though without practical experience it might be tough going, I mean practical engineering. The Project Management course is the same thing, simply having a degree does not make you a qualified project manager, you will have to have the experience combined with the education.
I know this all sounds a bit disheartening.
Are you still in the UK? Where? Depending on the where, perhaps you could look for work outside of your core degree field but within the practical / practice field. If you are serious about the possibility of wanting to pursue something in SAP, look for organizations that have implemented SAP. Meggitt is one such in Coventry.