I think I know what you mean, here's how I learnt to teach it.
First of all, teach you dog, to go around an object, not in a big circle, just go around it. When you can send him to go around an object from a bigger distance, start it all over, but with 2 objects (similar if possible). Keep them close at first, the you can move them further away (both from each other, and from you), then do this, until you have about 10 objects, in a circle.
Pay attention, that the dog shouldn't concentrate on YOUR position, so when the objects are in a circle, vary your position. You can stand in the circle, further away, etc. Use a different command for the way when you are standing in the middle of the circle, and when you are out of the circle.
When your dog knows this VERY well, do lots and lots of practice.
Then, you can start taking out the objects (still keeping the circle shape), just one at a time. Go slow, practice a lot.
In the end, when you have about 5 objects, take them all out. This may confuse the dog, if he doesn't understand, put them back, and send him around again.
This is the way I know you an teach a dog to go around in a big circle.
Hope I helped, happy training!