Your English is very poor, but I think I got this out of that:
Someone stole your sim card, but not your phone, and then called you and harassed your family, so now you want to know where to find the SIM? Seems kinda weird someone would steal JUST the sim card and not the phone, but OK then.
Sim cards cost $10, that's roughly 5 euros. You can not track a sim cards location, but you can disable it. Think of it like a credit card. Every transaction you make (which would be phone calls, text messages, etc etc) are charged to the sim card. If someone were to steal it, they would be free to make those transactions unless you called the company and cancelled the card.
For $10 it's not much of a loss. Just call the carrier and disable it, then order a new one.
Remember that any usage made on it while they have it in their possession is YOUR responsibility to pay for. In the event of theft or loss of your phone (or in this case apparently just the sim card), the first thing you should always do is call the phone company. Just hope they haven't been prank calling China.
I would suggest to ask your service provider to block the sim. Apanzee is right, if that person uses your sim for some illegal purpose, it will be you who will suffer. Some mobile applications are under process in order to deal with a situation like yours. Hope they'll be live soon.