If I play an action card and it is sabotaged, can I take another action?
From the FAQ here:
http://new.fantasyflightgames.com/ffg_content/Twilight%20Imperium%203/ti3faq2-2-4.pdf

Q: Is an Action Card that has been sabotaged considered played?
A:
No. For example, a “play as an action” Action Card that is  sabotaged
does not use up its owner’s action.

So yes, you should be able to play another action.