Suganuma Sadamura served as a bushō during the Sengoku period.  He was the second head of the Noda-Suganuma clan and served as the lord of Noda Castle.

Sadamura was born as the eldest son of Suganuma Sadanori.  In the first month of 1544, following the retirement of his father, Sadanori, Sadamura inherited the headship of the clan.  In the fourth month, he built the Nōman Temple on his territory to serve as the family temple for his mother.

In 1556, Okudaira Sadakatsu, a kokujin, or provincial landowner, in Mikawa and head of the Okudaira clan, responded to a solicitation from Mizuno Nobumoto (of the Oda clan) to defect from the Imagawa.  The Damine-Suganuma clan (the main branch of the Suganuma) joined in the rebellion.  Sadakatsu as well as members of the Damine-Suganuma holed-up in their respective castles.  Sadamura was not complicit in the rebellion but two of his younger brothers who held grievances toward him, namely, Sanemon 定円 and Denichirō Sadayori, joined sides with the Damine-Suganuma. 

From his base in Sunpu, Imagawa Yoshimoto ordered bushō in eastern Mikawa to suppress the rebels.  On 8/4, Sadamura led an army to attack the defenders of Achiha Castle in Ameyama in the Nukata District who had sided with Sadakatsu.  This event is known as the Battle of Ameyama.  Under the command of Sadamura, the forces from the Noda-Suganuma clan charged forward without trailing troops and launched into battle.  As Sadamura gave orders to his troops from atop his horse, a defender named Achiha Gorōbei shot an arrow that struck Sadamura on the left side of this throat and pierced through to his ear.  He then fell from his horse, fatally wounded.  Having lost their commander, the Noda-Suganuma forces scattered in disarray.  Two of Sadamura’s younger brothers, Shinzaemon 定貴 and Hangorō Sadamitsu, attempted to regroup but were also killed in action.

After Sadamura was buried at the Nōman Temple of his mother, the name was changed to the Dōun Temple.