is it possible to run a sopsolver dynamic simulation within a FOReach node ? i tried but it only does it for one but not for each. am i doing something wrong or i just cant do it ?

Not possible.
You can't spawn a sim for each for loop iteration.

is there a faster way to do it ? cause now i have a grid that is divided into 20 primivtives, and for each primitive i would like to perform a dyanamic simulation on them. What i am doing now is I am doing it manually.

I take it the various pieces don't have to interact so don't have to be in the same sim.

If the sims are all the same networks in side, then dial one in and write a simple script that counts the number of prims or groups in your target SOP and then automatically adds the appropriate number of Blasts followed by the sim node. Probably best to wrap your sim up in to an hda to make it easy.