The government agency confirmed on Wednesday that Castle would replace Peter Miskimmin next month, the latter having resigned after 11 years in the position.
The 49-year-old would be Sport NZ's third CEO and the first woman to hold what was New Zealand's top sports administration job.
Along with having been CEO at Netball New Zealand and Rugby Australia, Castle had also held the top job with the Bulldogs in rugby league's NRL.
