Thick, gray ash from the overnight explosion coated several farms around the Karo district, according to the national disaster agency.
There were no reports of injuries or fatalities. Nearly 15,000 residents were forced from their homes in mid-September when the mountain suddenly roared back to life with two explosions.
Mount Sinabung also surprised scientists in September 2010 by erupting suddenly for the first time in 400 years.
Two weeks of eruptions at that time forced more than 30,000 people from their homes.
Local vulcanologists failed to notice signs of rising magma, slight uplifts in land and minor volcanic tremors prior to the blasts.
Some archaeologists believe an eruption of a prehistoric volcano near Mount Sinabung nearly wiped out the human race when it erupted 69,000-77,000 years ago.