Welcome to the VMware Community forums. You'd first need to get a ESX(i) 4.0 driver for the HBA as there have been sufficient changes between 3.5 and 4.0 to require that. You'd then want to take the driver file and create a custom oem.tgz file which would also contain a modified simple.map file - http://www.vm-help.com/esx40i/customize_oem_tgz.php.
You can also check this page to see if ESXi will recognize the HBA by default - http://www.vm-help.com/esx40i/Hardware_support.php.