G450 CORPORATE FLT CREW EXPERIENCES RWY INCURSION AT SAT.

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WE WERE TAXIING OUT FOR DEP FROM RWY 30L IN SAT. WE WERE GIVEN INSTRUCTIONS TO TAXI ON TXWY R AND HOLD SHORT OF RWY 3/21. WHILE HOLDING SHORT; WE WERE GIVEN THE INSTRUCTIONS BY GND CTL TO 'EXPEDITE ACROSS RWY 30R AND HOLD SHORT OF RWY 30L.' WE STARTED TO MOVE DOWN RWY 3/21 AND AS THE PF; I WAS LOOKING TO EXPEDITE ACROSS THE FIRST SET OF HOLD SHORT LINES AND THEN HOLD SHORT OF THE SECOND. THE ONLY PROB IS; THERE IS NO HOLD SHORT LINE FOR RWY 30R; AS IT DOES NOT CROSS RWY 3/21. WE WERE BUSY LOOKING AT AN ARRIVING ACFT; TO VERIFY THAT WE HAD ENOUGH TIME TO CROSS THE RWY (THINKING HE WAS INBOUND TO RWY 30R). JUST AFTER XING THE FIRST SET OF HOLD SHORT LINES; WE REALIZED THAT WE HAD TAXIED ONTO RWY 30L; JUST AS GND WAS TELLING US AS WELL. WE QUICKLY CLRED THE RWY AND MADE A 180 DEG TURN TO HOLD SHORT OF RWY 30R ON THE OTHER SIDE. WE APOLOGIZED TO GND AND WERE TOLD 'NO PROB.' THERE WAS A B737 ON ABOUT A 4-5 MI FINAL. OTHER THAN THE CLRNC DEV; AT NO TIME WAS SAFETY OF EITHER ACFT COMPROMISED.