The Chilean forward netted in the 30th and 92nd minutes as the Gunners defeated the Black Cats 2-0 at the Stadium of Light.
Summer signing Sanchez capitalized on errors from Wes Brown and Vito Mannone to put the north Londoners back on the winners list and Wenger was delighted with his performance which saw his Premier League goal tally rise to five.
"He took advantage of the mistakes they made, but as well, he has super quality, Sanchez," said the Frenchman.
"He has has quick feet and that's why he wins many balls that normal players don't win.
"In transition from offence to defence, he is very quick and wins the ball back very quickly, and you can take advantage of that."
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