Two children were among the injured, according to the administration's post on the Telegram messaging app. Several residential houses and cars were damaged, it said.
The Sumy region, which borders Russia, has been subject to frequent attacks by Russian forces. Moscow denies targeting civilians, saying its attacks aim at destroying Ukraine's infrastructure critical to Kyiv's war efforts.
Thousands of civilians have died in the war, which Russia started with a full-scale invasion of Ukraine in February 2022. Millions of Ukrainians have also been displaced, while their cities and villages have become piles of rubble.