Can a sim card be tracked without phone?

The answer to - Can a sim card be tracked without phone is that any SIM/Computer which is not in any network cannot be traced. SIM card are slave computing device which requires an entity to send a command to which it shall respond to. To talk to SIM, SIM is needed to be powered. A typical GSM mobile SIM doesn't support being energized through magnetic induction so it requires power to be transmitted through physical contacts which is typically provided by the mobile device unit. Another important aspect is that SIM never talks to the GSM Network, SIM is first traced by the Mobile Equipment which request the SIM to provide its IMSI number. The Mobile equipment sends the IMSI number to the network it is trying to hook into. If the SIM is blocked like multiple wrong pins, than SIM might not allow the device to read the IMSI as well. It depends on how the OS in SIM is programmed. Hence a SIM card cannot be traced unless it is inserted into a mobile handset and the handset is in cellular provider coverage area. And yes the mobile battery should have sufficient charge.