Mariam Yahia Ibrahim Ishag’s death penalty was overturned by an appeal court, the official Suna news agency reported.
She is married to a Christian man and was sentenced under Sharia law to hang for apostasy in May after refusing to renounce Christianity.
Mariam Ibrahim’s husband, Daniel Wani, said he was looking forward to seeing her.
The death sentence for Mariam Yahia Ibrahim Ishag, who gave birth to a daughter in prison not long after she was convicted, sparked international outrage.
Born to a Muslim father, Mariam Ibrahim, 27, married Daniel Wani, a Christian, in 2011.
She has been in jail since February, along with her young son.
Sudan has a majority Muslim population. Islamic law has been in force there since the 1980s.
Even though Mariam Ibrahim was brought up as an Orthodox Christian, the authorities consider her to be a Muslim.
Her husband, who was born in South Sudan before it became independent from Sudan, went to the US in 1998 at the height of the civil war.
Daniel Wani met Mariam Ibrahim in 2011 on a visit to Sudan and they were married at the main church in Khartoum.
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