Yup. You just need the 2 save files from the world. On Windows, your friend can find them here : "%userprofile%\AppData\LocalLow\IronGate\Valheim\worlds"
Just copy the path between the quotes into your file explorer address bar, and you should see multiple files :
The two save files for my world are "RockfiresWorld.db" and "RockfiresWorld.fwl", so your friend needs to send them both to you. Do not rename the files, it breaks the world. Simply place them into your own worlds folder (address up there) and you should see them next time you start the game.