You could try speaking to your IP to see if there is anyway of funding the payments.
Otherwise, is it possible to wait until you have finished your IVA before starting a course?
Sharing from experiences of dealing with debt
The greatness of a man is not in how much wealth he acquires, but in his integrity and his ability to affect those around him positively.
Bob Marley. http://kallis3.blogs.iva.co.uk
What sort of course is it and how much would it cost on an annual basis? Could the payments be spread over monthly installments, and would the qualification improve your general earning potential?