You can. replace "YOURLOGONNAME" with what you used as your logon user on your old PC

Locate "C:\Users\YOURLOGONNAME\AppData\LocalLow\IronGate\Valheim\worlds" and there will be 2 files - a .db and a .fwl file. Copy these to the same folder on your new pc (launch the game first as I am unsure if this path is created at installation or post launch of the game itself)

Once copied, launch the game as play as you did beforehand.