Some ICT visa holders can switch but it depends on when your Entry Clearance ICT application was made. If you applied after 6th April 2011, then you cannot switch to a Tier 2 (General).
It is possible but as you have guessed, gaining Tier 2 sponsorship is not a walk in the park. A lot of companies do not hold a Tier 2 License and those who, often are reluctant to got through the sponsorship process.
Can I ask what your area of expertise / skill-set is?