Searching for specific TestCases

Yes it is.
You need the TestSuite from and the call getTestCaseAt or getTestCaseByName.

testRunner.testCase.testSuite.getTestCaseByName("xyz")

If you want the TestCase from another TestSuite you need to go at first to the project and then select the TestSuite you want.

testRunner.testCase.testSuite.project.getTestSuiteByName("abc")

Also you can have a look at these links and the get-methods:
http://www.soapui.org/apidocs/com/eviware/soapui/model/testsuite/TestCase.html
http://www.soapui.org/apidocs/com/eviware/soapui/model/project/Project.html
http://www.soapui.org/apidocs/com/eviware/soapui/model/testsuite/TestSuite.html

Madir,

if you don't mind me asking, why do you have 1000 test cases? Are they actually very different test cases or are you just changing a couple of variables from one to the next? If so, I would suggest using a datasource (easy to accomplish even without pro) and having that feed the data into the Test Cases based on which iteration it is in (Or, if you want to be fancy, build a UI).

It would be a lot easier to manage and maintain. I go crazy when my dev team sends me 30 TestCases.