Gerry Spessard scored Smithsburg's first goal in the 16th minute on a shot from the right side on an assist by Mike Trueblood.
Senior David McDougal scored the Leopards' second goal in the 34th minute from the right side on an assist by Spessard.
"We only played half of a game," Smithsburg coach Paul Newman said. "I thought that we played really well in the first half. I think that Boonsboro outplayed us in the second half. Boonsboro put a lot of pressure on the ball and my guys lost some of their composure. Instead of passing the ball, we started kicking the ball. We weren't playing our style of game."
Boonsboro's only score came in the 49th minute when Sean Beyard scored on an unassisted goal through the middle.
The Warriors outshot the Leopards, 14-9.
"I'm extremely proud of this year's team, especially the seniors," Boonsboro coach Bob Moats said.
In the girls' game, junior Kristen Poffenberger scored both goals for Smithsburg. The first goal went through the middle on an assist by Shannon Fowkes in the 28th minute. Her second goal went through the middle on an assist by Stephanie Smith in the 51st minute.
"We have been really passing the ball around very good," Poffenberger said. "I have just been able to finish it. Our team unity has been a lot better. Cortney Kerns leads our defense. She directs everybody and she is really good."
Smithsburg goalkeeper Candace Stanford made eight saves, while Boonsboro goalkeeper Haley Burtner had 13 saves.
"We got a solid effort from whatever 11 girls that we had out on the field," Smithsburg coach Bill Fowkes said. "Defensively, it was just another solid effort. We just try to eliminate as many chances as possible."
The Leopards outshot the Warriors (3-14) by a 13-8 margin.
"We went a lot further in the playoffs than what a lot of people expected," Boonsboro coach John Burtner said. "A lot of strong players will be back next year."