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Do you want to run the ESD simulations. I mean HBM or MM ?
if yes then you can use HBM & MM models (which contains only simple R, C & L). Give the conditions & you can simulate.
But if your ESD protection circuit is not simulatable, then you can not simulate it.
Just my own opinion, I don't think there is any effective commercial tool that can handle ESD simulation now. That's why it is called "black magic", spice can do some help here, but most of time, if you just want to make an effective ESD circuit, just follow the fab's design rule and the circuit and layout that has already been done by others.
I've tried to simulate HBM/MM using SPICE based tools but find that most models even in normal conduction are not very accurate in the high current regime of ESD. You foundry had to extend the models to get accurate high current behavior. As mentioned earlier, it is only valid for NON-breakdown/snapback behavior. If your clamps use snap-back or SCR action it will be difficult to simulate.
Yes !! I agree with DrProf. For Simulating Breakdown / Snapback behaviour, the foundry need to upgrade the models. Anyway, in modern designs we are usually moving towards the non-breakdown type of devices which are easy to simulate and predict
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