The Doncaster Rovers striker scored after 14 minutes against Middlesbrough three days after his two day old son, Luey Jacob, died.
The crowd watching the match commemorated Luey's life with a minute's applause before kick-off.
After the match had finished, Billy took to Twitter to call the goal, 'the most important' of his career:
"My goal tonight was the most important goal of my career dedicated to my brave boy luey jacob sharp I love u son sleep tight. thatsforyouson.
"To captain the side tonite was an honour and a pleasure, the minute applause I was crying meant so much to me thanks to both sets of fans. My goal had to be something special tonight for my special boy."
After scoring, Billy lifted his shirt to show a T-shirt with the words, "That's for you, son".
Both managers praised Sharp's attitude. Middlesbrough's Tony Mowbray said: "For him to score a wonder-goal, your headlines should be there really – a goal from heaven."