Seems like a casualty of Covid but as of May 2022 there are zero options for luggage storage at BCN airport which really ruined my layover plan.
There is a sleep and fly in the airport which is a lounge and has beds/rooms available but they claim to not offer luggage storage either and was told all beds/rooms were sold out on the day we arrived so that was not an option either.
With no way to hold our bags we were forced to hang out in the airport all day and stayed most of the time at the Sleep and Fly lounge.
Disappointed as it is hard to get updates like this ; my pre-trip planning made it seem like luggage storage at the airport would be easy but was all based on pre-Covid experiences so maybe this update will help others.