Hi, I’m based in NZ. There does seem to be a course in Whangarei. Apart from that I think that training is only available as part of a Diploma in Beauty Therapy Level 5.
But I’ll also say that it’s not really hard to learn on your own if you’re willing to put some effort into researching it (as long as you’re only doing it on yourselves). There’s lots of resources out there. I’ve had pretty good results doing galvanic electrolysis on myself: