updated: March 1, 2023
Greenland is a self-governing territory within the Kingdom of Denmark, therefore Denmark's entry requirements apply to Greenland as well, but can be further tightened by Greenland.
There are no COVID-19 related restrictions on entry to Denmark.
Link to detailed regulations.
The Naalakkersuisut (Greenlandic Government) has decided to lift the current entry restrictions from Wednesday 18 May 2022. This means that you do not need a test or vaccination document to travel to Greenland.
Link to official source.
Iceland has removed all Covid-19 related entry regulations on 25th February 2022.
Link to official source.