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How can I select an 1000A overload relay?

Generally at this load, the Soft Starter is recommended as it takes care of the thermal overload function.

For the DOL, there is no direct overload relay available beyond 630A.The overload protection at 1000A can be provided using external load CTs for each phase with the secondary connected either with an LRD relay ( selection based on CT secondary current ) OR else you can use an LTMR08*** ( Tesys T). The CTs required with Tesys T should have protection class 5P15 with maximum Primary current limited to 1000A and maximum secondary current limited to 8A .
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