There are two ways of playing this map:

To play this in offline mode you need to add the following to the launch options of CSGO: You can find the launch options by going to your games library, press the right mouse button on CSGO, select properties and press the 'Set launch options' button.

To play this in online mode you need to install Soccer Mod on a server. Check out the following guide to learn how: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=267151106
Feel free to ask any question if you can't get it to work.