Unvaccinated foreign nationals who are not holders of a Permanent Resident visa in Colombia will not be allowed to enter the country.
From 14 December, all international passengers 18 and above entering Colombia must show proof of vaccination upon entry to Colombia. The final vaccine dose must have been administered at least 14 days prior to travel (The definition of the complete scheme shall be in accordance with the technical recommendation of the producer of each vaccine).
The Colombian Government recognises those vaccines authorised by the WHO which can be checked here: https://covid19pharmacovigilance.paho.org/, or those officially approved by a country or territory recognised by the United Nations.