New Zealand Law
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You will be getting married in New Zealand, and the New Zealand dissolution of marriage will be recognised under New Zealand law is sufficient to dissolve the Sri Lankan marriage, which will make your New Zealand subsequent marriage valid. I don't know much about Sri Lankan law, but most countries do recognise a divorce made under other countries laws. But in this case you certainly can legally remarry.
You certainly can legally marry here. The New Zealand registry office will recognise the New Zealand order dissolving the Sri Lankan marriage and permit your remarriage. It doesn't matter whether the order is recognised in Sri Lanka, because it is recognised in New Zealand and you are getting married here