Travelling to Finland is still very restricted due to coronavirus pandemic. At the moment (19 May 2021) leisure travel is only possible from 7 countries: the Vatican, Australia, Singapore, Thailand, New Zealand South Korea and Rwanda.
There is no mandatory testing or quarantine for residents from the above mentioned countries on arrival in Finland.
Read more here.
If you are travelling to Finland, please refer to Finentry which is a useful digital service for managing travel to Finland.