Posted: Thu Aug 26, 2021 9:38pm
Unless you possess an EU passport (e.g. Irish) the answer is a resounding “no”.
If you hold a UK passport, it is no longer possible to apply for Residencia and do 6 months here, 6 months overseas. You have to apply to migrate, and that must be done from the consulate or embassy in your parent country; further to that, a condition of the visa will be that you do not spend more than 10 months aggregate in the first five years absent from Spain.
If you have an EU passport, then Residencia is still an option, but it must be borne in mind that Residencia is not an extended holiday permit - it means Spain becomes your country of primary residence. You will be obliged to spend a minimum of 183 days a year here to fulfill one of the conditions of maintaining your Residencia, be tax resident and pay tax on worldwide income in Spain.
Absent either of those two options, you are not permitted to spend longer than 90 days here.