Hi,
most definitely so.
We have 2 weeks school holidays in winter(usually in July), and you might get lucky then, since a lot of Physio Assistants are working mums, but...
Anyway, just try and don't give up.
And if you can't get into Physio/ Allied Health, try the HCA option. I'm sure, there's always a shortage there. General hospitals (DHB and private ones like Ascot in Auckland), private hospitals and resthomes would have jobs. Otherwise, there is also schools who have special needs/ rehabilitation departments (e.g. Wilson Home Trust in Auckland). They might need assistants.
Good luck,
Fyzzio