Oman’s arrival requirements for when commercial flights start in the country following reopening after Covid-19.
1/Non-residents arriving in Oman are subject to institutional quarantine for 14 days at their cost
2/ All visitors are required to have health insurance valid for the full duration of their stay in Oman.
3/ Non-Omanis are allowed to enter Oman only under a permit issued by the Ministry of Foreign Affairs via their embassy or sponsor or national airlines (Oman Air and Salam Air).
Item 2 is likly to continue after the other requirements are abandoned.
More details here