Sahaidakovskyi studied at the Faculty of Architecture of the Lviv Polytechnic Institute (1974–1979) while also taking painting lessons from Roman Selskyi and Karl Zvirynskyi, whom he names as his mentors.

His artistic method is rooted in everyday life as material: he often paints on carpets and rough textiles, using his own term to smear (“pachkaty”), combining fragmentary texts with imagery and capturing comically absurd scenes of daily existence. This distinctive style, with its unconventional tools and textures, emerged in the late 1980s and has since become widely recognized.

In 1990, in Lviv, he took part in the scandalous group exhibition Defloration, curated by Heorhii Kosovan. Within the Ukrainian context, this marked the transition toward curator-led and individual postmodern projects. The exhibition also became one of Sahaidakovskyi’s first entry points into the new institutional landscape of the 1990s. His first solo exhibition was held in 1993 at Dzyga Contemporary Art Space in Lviv. Since then, the artist has exhibited in Ukraine and abroad (Warsaw, Paris, Regensburg, Perm, Kyiv, Lviv). Since 2008, he has been working regularly with Ya Gallery Art Center.

Notable solo projects include: Quote (presented in several editions, 2008–2012, Kyiv), A Walk Through the Forest Paths (Kyiv, 2013), Landscapes (Dnipro, 2015), Listen Carefully (Kyiv, 2017), Void (Lviv National Art Gallery, 2017), and A Bit of Sky (Kyiv, 2019). Among his other significant works are: The Leg (1995), Who Are You, Doctor (1996), White Chinese Sneakers (2009), Landscape with Venus (2015).

Andrii Sahaidakovskyi lives and works in Lviv.