Downloading Sokoban for Windows 2.3 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. We recommend checking the downloaded files with any free antivirus. The actual developer of this software for Mac is Björn Källmark.
From the developer:
Cool version of this classic strategy game. The object of the game is to push boxes into their correct position in a crowded warehouse with a minimal number of pushes and moves. It sounds easy, but wait till you have tried it. More than 3600 levels
You may want to check out more Mac applications, such as Sokoban++, Sokoban for Beginners or Window Tidy, which might be similar to Sokoban for Windows.