San Dia labs is north of Albuquerqe
Perhaps you are thinking of Sandia Pueblo.
Sandia Labs is (mostly) on Kirtland Airforce Base, on the south side of the city and extending east into the foothills of the Manzano mountains.
Los Alamos is north of Albuquerque, actually north and a bit west of Santa Fe. Sandia is around the same area as the Albuquerque Sunport (international airport), along with Kirtland AFB, all on the east side of Albuquerque. Roughly near the southeast corner of the interchange of I-25 and I-40.
I have done business with both labs when I lived in ABQ, and am familiar with the time that Hazel O’Leary, then Secretary of Energy under Bill Clinton was at Los Alamos for a meeting. She would not allow the meeting to proceed unless there was another black person there - she insisted on any black person, and it had to be RIGHT NOW! So they jumped through hoops and grabbed the first black they could for the meeting. Then they could not discuss anything since that person, brought into the meeting for the sole purpose of appeasing Witch Hazel, did not have the required Q clearance. I knew one of the physicists who was in that meeting.
South edge of town. Los Alamos is north.