Higgins, from Glenelg, amassed 425 runs in six games at an average of 85 to win the batting award and also earn a spot in the Cricket Australia XI to compete at the Under 19 national championships (male) in Perth in December.
The opening batter and son of former State player Ben Higgins started the championships with scores of 108 and 110 not out and then in round four fell agonisingly short of a third century when he was dismissed for 98 after stepping on his stumps.
He finished the carnival with another half-century on Thursday.
SA started the championships strongly, losing a last-over thriller to New South Wales and then defeating a Cricket Australia XI, but lost its last four matches.
Zack McCabe was SA’s next highest scorer, with 128 runs at 21.3, and leading wicket-taker was Sebastian Young with 12 at 28.17.
Western Australia secured the title with a one-run win over NSW Metro.