Son struck a brace in a 5-0 win over Bournemouth to take his tally to five goals in his past three games in all competitions.
The 26-year-old has netted 10 goals for Spurs, who moved into second in the Premier League, this season.
Pochettino, who will be without the South Korea international in January due to the Asian Cup, was full of praise for Son.
"Unbelievable. What can I say? Sonny is doing a fantastic job for the team," he told a news conference.
"After November he had a rest and was here trying to recover his best and I think he is doing fantastic. He started his fantastic run against Chelsea and until today he is doing a fantastic job for the team.
"I hope he can keep that level but you know he is going to be away from Tottenham because he needs to go with his national team to Dubai to play the Asian Cup."
Christian Eriksen, Lucas Moura and Harry Kane were also on the scoresheet as Spurs claimed a fifth straight league win.
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