Under the new COVID-19 Protection Framework, sport, active recreation and play can take place with restrictions implemented geographically to protect at-risk people and minimise the risk of community transmission. Your setting will depend on where you are in New Zealand.
All outdoor parks, fields and playgrounds can open for use, along with public facilities, which will operate under specific settings. Most sport and recreation can be played under Gatherings restrictions. The number that can meet at a Gathering depends on whether vaccine passes are required and checked or not.
The current Setting for your region can be found here. https://covid19.govt.nz/traffic-lights/traffic-light-map/
See the new protection framework summary here. https://sportnz.org.nz/media/4672/211123_uac_cpfsummary_a3_v0-9.pdf