Which course should I pursue to get a good salary package, computer science, CSE, network security or cyber security?

Hi, It depends on your skills and knowledge because every filed have its own value and importance. All the best.

At graduation level, I will recommend you to opt for B.Tech CSE from Tier I engineering colleges for best campus placement and starting salaries. In case you plan to specialize after graduation you may chose any area in which your develop interest during your graduation studies.