You can have a look at the W'ton newspaper site (Dominion/Evening Post) for vacancies: http://www.stuff.co.nz/
Or go to http://www.nzjobs.co.nz/health/index.cfm for more. I see physiojobs advertised on a regular base, usually in hospitals, also in the Wellington area (incl. Lower Hutt)
You can also try an agency like http://www.medicalstaffing.co.nz