[racket] setup sandbox eval with submodule

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I'd like to create a sandbox evaluator that uses a language created in
a submodule.  So something like this:

#lang racket
(require racket/sandbox
         scribble/eval)

(module+ some-lang
  (provide (all-defined-out))
  (define #%top-interaction '...)
  (define #%module-begin '...))

(define ev
  (call-with-trusted-sandbox-configuration
   (lambda ()
     (parameterize ([sandbox-output 'string]
                    [sandbox-error-output 'string])
       (let ([the-eval (make-base-eval)])
         (the-eval `(require ???????))
         the-eval)))))

But I'm lost figuring out what to put for ??????? to make this work
out.  Is there a way to make this work?

Thanks,
David
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