I created a soccer goal in Blender a while back. Most of the goals I see available on CGTrader have nets that look like they were strong tight and frozen in place. I tried to correct creating a mesh and using the fabric simulator to create realistic slack. I then removed the faces and converted the edges to curves. I also added details like the corner brackets and the nets clips.
This model is available at CGTrader.com … https://www.cgtrader.com/3d-models/sports/equipment/soccer-goal-84d3b784-fbf3-4410-a1b4-f7d77c6b1c04
Simmer3D 