There are many simulators are avaible. Few links and papers are attached here.

Some well known simulator are:

Castalia

Cooja

OMNET++

TOSSIM Avrora 

NS-2, NS-3

Chhimwal, P.; Rai, D.S.; Rawat, D. Comparison between different wireless sensor simulation tools. IOSR-JECE 2013, 5, 54–60.

Pathan, A.K.; Monowar, M.M.; Khan, S. Simulation Technologies in Networking and Communications: Selecting the Best Tool for the Test; CRC Press: Boca Raton, FL, USA, 2014.

Sarkar, N.I.; Halim, S.A. A Review of Simulation of Telecommunication Networks: Simulators, Classification, Comparison, Methodologies, and Recommendations. JSAT 2011, 2, 10–17.

The Network Simulator Version 2. Available online: http://www.isi.edu/nsnam/ns/

The NS-3 Network Simulator. Available online: http://www.nsnam.org

http://nielit.gov.in/sites/default/files/7.pdf

https://www.researchgate.net/publication/232614169_ASF_an_Attack_Simulation_Framework_for_wireless_sensor_networks

Conference Paper ASF: an Attack Simulation Framework for wireless sensor networks

NetSim is probably the best tool for this and sample source codes and documentation is available at http://tetcos.com/file-exchange.html

I would recommend NetSim as well. It has the best documentation and support.

https://www.diva-portal.org/smash/get/diva2:1043545/FULLTEXT01.pdf

http://eprints.mdx.ac.uk/17391/1/doddapaneni%2C_krishna_chaitanya_ghosh%2C_arindam_-_analysis_of_denial-of-service_attacks_on_wireless_sensor_networks_using_simulation.pdf