In a statement obtained by TMZ Sports, Sano says the story is completely false ... saying, "I unequivocally deny the allegation made against me today — it never happened.
"I have the utmost respect for women, especially those working in professional sports, and I deeply sympathize with anyone who has experienced sexual harassment. There is no place for it in our society."
The Twins have released a statement, saying they're aware of the allegations and taking them "very seriously."
We've reached out to Bissen for comment ... so far, no word back.