Harting School beat off the challenge of 12 other schools to win a mixed seven-a-side football tournament at Midhurst Rother College.
At full-time in a tense and closely contested final the score was 0-0.
The referee decided to let the game continue until one team scored, and Harting grabbed the winner.
Headteacher Fiona Mullett said: “Despite being a small rural primary we have good PE teaching and talented players.
“We are very proud of the children – they showed determination, team spirit and good sportsmanship.”