Service Catalog responsibilities

Answer:
Following belongs to the Service Managers' responsibilities:
- accountable for the delivery of a specific IT service (ensuring that the ongoing service delivery and support meet agreed customer requirements)
- responsible to the customer for the initiation, transition and ongoing maintenance and support of a particular service and accountable to the IT director or service management director for the delivery of the service.
- the service owner’s accountability for a specific service within an organization is independent o f where the underpinning technology components, processes or professional capabilities reside.
- responsible for continual improvement and the management of change affecting the service under their care

So, if your sales team is capable to fulfill above requirements - then yes, they can be the service owners (of the business part of the service catalogue).