Oman’s authorities have given an overview of Oman’s Travel Regulation regarding Covid-19 for future visitors entering the country via the airports.
I suspect many requirements will also eventually apply if arriving by road or sea, especially insurance and reserved accommodation. Always check with your own Foreign Ministry for their travel advice and with the airline you use for up-to-date information as it is very likely to change periodically. Critical is the entry visa if you are not an Omani – check Oman Visa detailed requirements
The issuing authority of visas for Oman, the Royal Oman Police have announced that the Oman Visa application process is updated – read what needs to be done to apply for an Oman visit visa, based on their announcement.