TAFE programs
Many TAFE campuses in Australia provide courses in proofreading, editing and publishing. These include both vocational/award courses and short courses.
Short courses in proofreading and editing are available in New South Wales, Queensland, and South Australia. You can study these courses internally (Sydney and Adelaide) or externally (Queensland and South Australia). They cover basic skills.
A one-semester Journalism (Editing for Publication) course is available in Canberra. Delivery is internal.
A Certificate IV in Professional Writing and Editing is available in Victoria. While this course focuses on writing, it does include editing subjects. You can study internally, online or via flexible/external delivery.
Brochure on editing