I was able to play a game against my own team in the sandbox mode. It was a bloodbath with 170 kills. Here is a Screenshot that I won against myself. http://imgur.com/O6D9MyR
I guess this is a known "bug". By altering the number after the last slash in https://www.lolmanager.gg/games/generate/<<NUMBER>> you can play against whoever you want. Including your own team. The game ID is the last number in your link, so it is: 76131. If you want to see a report for the game (not the play back) you just switch the world "replay" for show. Like this: https://www.lolmanager.gg/games/show/76131
However maybe it's a bug that you found your team listed in the sandbox. Don't know about that ;)
As it's testing period I think these types of things are fine. It might be even good that you can play against yourself as to test more edge cases in simulator.
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Ok, so I wasn't totally wrong. You are just more technically right :p
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This was reported a few days ago by myself, I guess it's fine since there isn't a list of known bugs on the forum, but please try to research if your bug was already reported before duplicating topics.