"We're looking at our options and of course that could include trespass action."
Shelly Bay has been the source of controversy in a separate occupation that lasted 16 months by a group called Mau Whenua.
The prime real estate there is earmarked for a $500 million development, featuring 350 new homes, a boutique hotel and a village green.
But the plan has been bogged down in legal challenges and disputes since its conception.
Mau Whenua has claimed the Port Nicholson Block Settlement Trust went against the will of its own people when it sold its land at Shelly Bay for development and that the deal was done in secret.
But the two parties have recently started collaborating after a change in the trust's leadership.
Mau Whenua has previously issued a Facebook post publicly distancing the group from the Māhanga Bay protesters.
"We do not align with, or support in any way the actions or behaviours they are displaying and stand with the Motukairangi/Wellington community and others in encouraging the current landowners and officials to address the serious problems that are being created by this group," it read.