No, there isn't sand on the floor of the colosseum because there is no floor. What was once was the floor is gone. When you visit it you look down into what was under the floor originally. When the Romans used the colosseum they could flood the floor to have sea battles.
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There were 80 exits in the Colosseum
The Colosseum.
Colosseum, and a spanish bull ring! >:D (in spain) :/
In terms of scale they are comparable because the Colosseum could host 50,000 spectators. In terms of purpose they are not comparable because the Colosseum was an arena for gladiatorial combats
Colosseum