Lebohang Maboe netted a hat-trick for the Brazilians to lead them to the summit of the league standings and subsequently secure a 10th league title in the Premier Soccer League era. Sundowns end the season on 59 points, two clear of Kaizer Chiefs who could only manage a 1-1 draw against Baroka FC.
Defeat condemns Leopards to the promotion/ relegation playoffs where they will battle Ajax Cape Town and Tshakhuma Tsha Madzivhandila for a place in South Africa's top-flight next season.
Sundowns squandered a chance to open the scoring in the 32nd minute. The Tshwane club were awarded a penalty following a reckless challenge on Themba Zwane but King Ndlovu denied the usually reliable Ricardo Nascimento from the spot.
The Brazilians finally got their goal in the last play of the half as Maboe headed home Zwane's inch-perfect cross, but with the Amakhosi leading 1-0 at Bidvest Stadium, the title was the Soweto club's to lose at the halfway mark.