Upvote:2
Yes, if that travel is covered by the premise which you filed when you applied for the visa. If you told them that you are a business traveler and that you want to visit many different Schengen countries, and if they gave you a multiple entry visa on that basis, you can use the visa to visit Finland after going to Spain.
No, if you gave a different premise with your application. If you told them that you want to go to Spain, you should use the visa to go to Spain and not to Finland.