The Freiburg court also jailed her partner, the boy's stepfather, for 12 years. They were sentenced to prison in a case that has horrified the country.
The court heard that the mother, Berrin T, would drive her son to meet with these paedophiles and then force him to take part in the sexual assaults.
A German mother and her partner were convicted Tuesday over the repeated rape of the woman's young son and for selling him for sex on the internet.
Six men who paid to abuse the boy will serve between eight and 10 years; the mother, Berrin T., will serve 12.5; her partner, Christian L., will serve 12. Some of the abuse was filmed.
Six other people were arrested along with the couple last autumn - with several men already convicted in separate trials.
Lais, 39, had a previous conviction for child abuse, raising questions why he was allowed to live in a home with a child present.
The stepfather has a previous conviction for paedophilia, the AFP reported.
The German nationals, 48 and 39 years old, had sexually abused the boy themselves for at least two years.
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They also admitted they had sexually abused their son, who was nine at the time.
In the following months, the court said, the woman organized assaults on a 2-year-old girl she occasionally looked after.
The mother was often near the scene of the abuse by other men "to exert a calming influence on her child", and in the case of one client participated herself, the court said.
Video footage catalogued the horror of the boy's abuse, which included him being tied up and subjected to verbal humiliation.
The case has shocked German society - and local authorities have been accused of failing to protect the boy, who now lives with a foster family.
In Tuesday's verdict, the couple was ordered to pay a total 42,500 euros (£38,000) in compensation to the boy and another victim, a young girl.
Police exposed the paedophile ring after they received an anonymous tip-off from a member of the public.