The Didrichsen Art Museum is surrounded by a public sculpture park. The park is enriched by sculptures from the Didrichsen collection, such as works by Henry Moore, Bernard Meadows, Mario Negri, Lionel Smit, Eila Hiltunen, Laila Pullinen and Eero Hiironen. In addition to permanent works the museum displays changing artworks by contemporary artists. During Björn Weckström's exhibition, until  January 30, 2022, five works by Weckström are on display.

Modern and contemporary sculptures have been a part of Didrichsen Art Museum from the beginning. The harmony of architecture and nature was essential in Viljo Revell’s visions when planning the Villa and the museum wing.

The park was completely renewed in 2013–2014 during the renovation of the museum. The renewed Sculpture Park is a unique cultural attraction in Helsinki. The entrance is free. The museum's courtyard and the pier are open during the museum's operating hours.