The 22-year-old has nine international caps to his name with his last Test coming against Australia at the back end of last year.
And Tandy believes Biggar - who contributed 25 points - should be in the running to face the Wallabies again next month after his recent form.
"I don't want to big him up too much, but Daniel's been great, on and off the field," Tandy told Wales Online.
"He's maturing and is really running our game. 'Biggs' is enjoying himself getting on with where we want to go.
"He's doing everything and he's really putting both hands up for Wales selection."
But Biggar - who passed 1,000 points for the Ospreys against Munster - was quick to pour cold water on any potential international call up.
"The Wales squad is nothing to do with me," said Biggar. "I'm enjoying my job here at the Ospreys. As long as we keep winning I will be happy.
"It's a nice little memento to pass 1,000 points, but as long as we win the Pro12 final, I wouldn't care if I didn't score another point this year."
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