Jamie Mitchell is one of the 'Master Coaches' for the Academy of Surfing Instructors. They run 4 levels of SUP instructors courses - from flatwater through to advanced SUP surfing. They also offer school accreditation & 'international' group insurance cover.
Surfing Australia is currently 'accrediting' SUP schools but is still to produce a SUP policy and instructors course. They plan to have a course available around the middle of the year. (NB - their fees & affiliation charges are about 30% more than ASI)