Unless you are from Spain, it may be difficult. However, rumors persist of a few Central American types being allowed in the ranks in the last decade or so. I would travel to Spain and stop by an Army recruiting office and ask. Be careful though if you have a Spanish last name you could windup in their regular army.
BTW, it's really known as as the Spanish Legion, it changed when they stopped actively recruiting foreigners.
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Unless you are French, you can only join the French Foreign Legion.
Around 1500 to date
I joined the Legion in 1993,at the ame time there was aguy from Holland who turned up to join without a passport,he was shown the door and told to come back with his passport.
Many nations have had a "foreign legion", but the French Foreign Legion is the most popular.
the legion is our country,patriotism is to the legion itself, not france