In order to do an internship you would need to qualify to do a BPsych equivalency with an accredited university/ college.
In Gauteng, Midrand Graduate Institute and Unisa were doing the program; UNISA is no longer doing it next year (2013) and MGI is terminating their program in 2015. MGI is also a private tertiary institution which means they charge more.
Internships need to be supervised and finalised by academic institutions because they fill in section C of Form 225 that is sent to the HPCSA who will then allow you to sit for the board exam.
Good luck for your future in Psychology.