Scarratt saw off the challenge of her England colleagues Sarah Bern and Katy Daley-McLean. France's Pauline Bourdon and New Zealand's Kendra Cocksedge were also nominated.
Previous English winners of the award include Sarah Hunter, Maggie Alphonsi and Shelley Rae.
"It's mad," Scarratt said. "At the start of the season, I was still playing Sevens, so I have come back to XVs and got my teeth back into it.