Cosby assaulted Constand, who once considered him a mentor, at his suburban Philadelphia home in 2004.
Constand said her training as a professional basketball player had led her to think she could handle anything, but "life as I knew it" ended on the night that Cosby knocked her out with pills and violated her.
Constand, who is now a massage therapist living in Canada, testified during the trial in April and in an earlier trial a year ago that ended with a hung jury that she had become friends with Cosby, and viewed him as a mentor.
Cosby's lawyers asked for house arrest, saying Cosby - who is legally blind - is too old and vulnerable to do time in prison.
The actor was accused by dozens of women for sexual misconduct, stemming from over the decades, however, Constand's allegations are the only ones that have resulted in criminal charges.
Montgomery County Court of Common Pleas Judge Steven O'Neill also chose to designate Cosby a "sexually violent predator" under Pennsylvania law. - Lili Bernard, who said Cosby sexually assaulted her before giving her a one-time role on "The Cosby Show" in 1992.
Cosby requested to be freed on bail pending appeal but he was shut down quickly as he was remanded into custody according to The Blast.
She said she lived alone with her two dogs and had trouble trusting people.
"Bill Cosby took my lovely, healthy young spirit and crushed it", she wrote.
The jury - made up of seven men and five women - deliberated for 14 hours in April following the two-week retrial at Montgomery County Courthouse in Norristown, Pennsylvania.
Cosby's wife, Camille, has not been present at the sentencing.
"Today a PA court deemed #BillCosby a Violent Sexual Predator b4 sentencing him". "Dr. Cosby has been one of the greatest civil rights leaders in the United States for over the last 50 years". Mr. Cosby, this has all circled back to you.
On Monday, a prosecution expert said Cosby should be labeled a "sexually violent predator" because he has a mental disorder that involves urges toward nonconsenting women.
The comedian's sentence was actually dropped from 30 years to 10 years.
Andrea Constand says she's had to cope with years of unrelenting pain, anxiety and self-doubt after Bill Cosby drugged and sexually assaulted her at his home in 2004. It had been assumed all along that Cosby would face at least some jail time.
It's a reckoning that accusers and prosecutors say has been decades in the making. They argued that Cosby should serve his time on house arrest.