Just look this up. …..

*Important update (January 13, 2023)*

There are no special requirements related to Covid-19 with the exception of visitors from China, Hong Kong, Macao and Taiwan who have been in those territories during the last 14 days.

These visitors must provide a PCR-RT or antigen Covid-19 test with a negative result that was performed by a laboratory less than 72 hours before their entry into Costa Rica.

Furthermore, individuals from the above-mentioned places of origin over the age of 12 must have a document that makes it possible to verify that they are up-to-date on their Covid vaccination.