The South Korea international found the net for the fourth successive game, helping Spurs take a commanding lead in their last-16 tie.
In the absence of Harry Kane and Dele Alli, the focus has fallen on Son and he has not shirked the responsibility, with his 47th-minute strike against Dortmund setting them on their way to an impressive victory on Wednesday.
After being informed that Spurs always triumph this season when the 26-year-old scores, Pochettino was quick to praise the in-form forward during his post-match press conference.
"Next time Son scores I will go to the dressing room, have a shower and wait for the game to finish," he joked to the media.
"Son was fantastic again, he's doing fantastic. He's a player that provides the team with a lot of very good things.
"His smile, he translates good energy and his performance in every game is improving. We’re so happy."
Son was not alone in earning Pochettino's praise, however, as the Spurs boss was ecstatic at the team's performance following a tough Premier League fixture against Leicester City on Sunday.
"I feel so proud. My players are heroes," he added.
"It was a massive victory for us and the players deserve all the credit. It was fantastic.
"To play with one day less recovery, we need to praise them. They've won the possibility to have a few days off."
Spurs won't return to the pitch until February 23, when they take on Burnley in a Premier League clash.
And while they have a commanding lead from the first leg, the club still has some work to do to finish off Borussia Dortmund, who will host the second leg of their Champions League tie on March 5.