Vincent Mickle, 35, must spend between 12 and 25 years in prison.
He pleaded guilty to those charges in June, 2011. Investigators said he posed as an 18-year-old boy and befriended the girls on social networking websites.
Mickle was also accused of having sex with a16-year-old. In addition, police said, child pornography was found on his computer.
Police say the investigation began when Mickle gained the trust of a 14-year-old girl and began exchanging sexually explicit photos with the girl via the internet and over cell phones.
He then allegedly met the girl at Frankford and Cottman and solicited sex, but the girl did not comply. Soon after, police were notified.
Authorities say the incidents have been going on since 2007.
Mickle once coached the Lighthouse Soccer Club in Northeast Philadelphia.