There are some specific entry requirements
Check your travel requirements before traveling to Sierra Leone. Visitors to Sierra Leone, with the exception of ECOWAS (Economic Community of West African States) residents, will need a visa to enter the country. Visa on arrival is accessible for citizens of several nationalities and costs $80 USD; nevertheless, you may choose to obtain your visa in advance. To obtain your visa, contact Visit Sierra Leone (VSL) and request that they process your visa. After uploading a copy of your passport and paying the $110 non-ECOWAS cost, they will handle forwarding your application to the Immigration Office and email you all documents when they are available. Tourist visas are valid for a maximum of 30 days.
A negative PCR test did no more than 72 hours before your trip is also required for travel to Sierra Leone. You will be tested again upon arrival at Lungi International Airport in Freetown – a PCR and a fast test – for which you must apply and pay (about $75 USD) via this page. To receive the PCR test results, you will need to supply a local phone number (the form will ask whether you need a local SIM card, which you can get as soon as you land and charge as much credit as you like); nevertheless, if the quick test is negative, you will be free to enter the country.
Last but not least, bring proof of Yellow Fever vaccination.