Wada Sadatoshi served as a bushō during the Sengoku and Azuchi-Momoyama periods. He was a retainer of the Oda clan. His common name was Shinsuke.
Sadatoshi was born as the second son of Wada Sōryū (Koresuke). His older brother was Wada Koremasa.
Together with Koremasa, Sadatoshi attended the march upon Kyōto by Ashikaga Yoshiaki (the fifteenth and final shōgun). Thereafter, he served Oda Nobunaga and was awarded Kuroda Castle in the Haguri District of Owari Province. Kuroda Castle was in a strategic location near the Kiso River between Owari and Mino provinces. While the lord of Kuroda Castle, he served as the chief retainer of Oda Nobukiyo.
On 7/12 of Eiroku 1 (1558), Nobukiyo supported Nobunaga in the Battle of Ukino and attacks on Iwakura Castle, but this led to a dispute in regard to disposition of the former territory of Oda Nobukata (who had been ousted). In 1562, Nobukiyo rebelled and captured Gakuden Castle in the Niwa District of Owari. Nobunaga responded with an offensive, toppling a number of outlying castles.
At the time of Nobukiyo’s rebellion, Sadatoshi and another chief retainer of Nobukiyo named Nakajima Bungo-no-kami were lured by Niwa Nagahide to switch their allegiance to Nobunaga, whereupon they assisted Nobunaga’s army. In the fifth month of 1564, Nobukiyo’s base at Inuyama Castle fell and he finally fled to Kai Province. Nobukiyo then resided in Kai under the protection of the Kai-Takeda clan, adopting the name of Inuyama Tessai.
Thereafter, in 1569, Sadatoshi participated in the Siege of Ōkawachi Castle and, in 1571, in attacks against the Nagashima Ikkō-ikki forces. In 1574, Sadatoshi joined Nakajima Bungo-no-kami in attacks in Nagashima on behalf of Oda Nobutada, but was killed in action. Sadatoshi was succeeded by his younger brother, Hachirō (Sadanori).