AN H25A CREW; ASSIGNED A LAGOON VISUAL AT TJSJ; OVERSHOT FINAL; SPAWNING A QUERY FROM ATC.

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WHILE ENRTE FROM ST THOMAS TO SAN JUAN; WE WERE BEING VECTORED FOR THE ILS RWY 10 APCH. WHILE ON R DOWNWIND FOR RWY 10; WE WERE SWITCHED TO THE LAGOON VISUAL FOR RWY 8. WE PULLED THAT CHART OUT WHICH IS BASICALLY AN ILS FOR RWY 10; WITH A SIDESTEP TO RWY 8. THE PROC TELLS YOU TO REMAIN ON OR N OF THE RWY 10 FINAL APCH COURSE DUE TO SIMULTANEOUS VISUAL APCHS TO RWY 10. AFTER THE APCH SWITCH; WERE INFORMED OF AIRBUS TFC THAT WAS ON FINAL THAT WE WERE TO FOLLOW IN. WHEN I SAW THE TFC; THE CTLR TOLD US TO FOLLOW THE TFC; AND CLRED US FOR THE LAGOON VISUAL APCH. WHILE ON BASE LEG; I EXTENDED IT TO KEEP 5 MI SEPARATION FROM THE AIRBUS. THE PROC ALLOWS FOR THIS BECAUSE IT SAYS TO REMAIN ON OR N OF THE LOC. I MADE MY TURN ONTO FINAL L OF THE LOC; THE REASON I OVERSHOT IT WAS TO KEEP MY DISTANCE FROM THE AIRBUS. AS I WAS CORRECTING TO THE R BACK ON THE LOC; THE CTLR CALLED ME AND SAID THAT I WAS LINED UP FOR THE WRONG ARPT. IF YOU LOOK AT THE PROC; IT TELLS YOU THAT FERNANDO LUIS RIBAS ARPT CAN BE MISTAKEN FOR SAN JUAN. WE WERE CORRECTING TO GET BACK ON THE LOC; WHEN THIS HAPPENED. WE SAW SAN JUAN ARPT; BUT THE CTLR THOUGHT THAT WE WERE LINED UP FOR FERNANDO LUIS ARPT. AFTER WE LANDED WE WERE TOLD TO CALL THE TWR; AND WE EXPLAINED WHAT WE DID. IF THE PROC CALLS FOR YOU TO BE N OF THE FINAL APCH COURSE; THEN THEY HAVE TO EXPECT THIS IS GOING TO HAPPEN. CONTRIBUTING FACTORS WERE A LANGUAGE PROB WITH THE APCH CTLR. WHEN SWITCHING OUR APCH WE COULDN'T UNDERSTAND HIM TOO WELL; WHICH LED TO A LAST MIN BRIEF ON THE APCH. ALSO; I THINK THEY NEED TO GIVE A MAX DISTANCE THAT YOU CAN BE N OF THE FINAL APCH COURSE. WE WERE TOLD THAT THIS IS A COMMON OCCURRENCE AT THIS ARPT.