Good news - you don't necessarily need to be a resident in Spain to buy a car a Spain, whether new or second hand, but you will be required to provide proof of ...
Can I insure a car in Spain as a non resident?
If your car is not Spanish and you don't have a NIE or resident's permit, you won't be able to insure it with a Spanish insurance company. If your car has a Spanish number plate, you can get insurance without a NIE, just using your passport.
Can anyone drive an insured car in Spain?
In Spain, it is not necessary to include an additional driver in the insurance if he or she meets the age and experience requirements of the insurance company. With most insurers, any driver with a valid licence may drive the car as long as he/she is over 25/26 years old and have more than 2 years experience.
What documents do I need to insure a car in Spain?
If you're driving in most European countries All UK vehicle insurance provides the minimum third party cover to drive in: the EU (including Ireland) Andorra.